highlight line chart?

[Dmoney]

With a column chart I can highlight a specific data point using something like this:

series.highlightItem(items[i]);

but I would like to do the same thing with a line chart.

currently if I use the method above the entire line is highlighted I would like to highlight the data point only like on a hover. is this possible?

[Dmoney]

ok it looks like the highlight is working but The radius setting is lost and it makes it not very obvious. anyways to keep the radius setting with the following function?

series = Ext.getCmp('myChart').series.get(0);
series.highlight = true;
series.unHighlightItem();
series.cleanHighlights();


items = series.items;
series.highlightItem(items[3]);
 series.highlight = false;